1 /*++ @file 2 Temp RAM PPI 3 4 Copyright (c) 2011, Apple Inc. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include <PiPei.h> 16 #include <Library/DebugLib.h> 17 #include <Library/BaseMemoryLib.h> 18 19 #include <Ppi/TemporaryRamSupport.h> 20 21 VOID 22 EFIAPI 23 SecSwitchStack ( 24 UINT32 TemporaryMemoryBase, 25 UINT32 PermenentMemoryBase 26 ); 27 28 29 EFI_STATUS 30 EFIAPI 31 SecTemporaryRamSupport ( 32 IN CONST EFI_PEI_SERVICES **PeiServices, 33 IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, 34 IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, 35 IN UINTN CopySize 36 ) 37 { 38 // 39 // Migrate the whole temporary memory to permanent memory. 40 // 41 CopyMem ( 42 (VOID*)(UINTN)PermanentMemoryBase, 43 (VOID*)(UINTN)TemporaryMemoryBase, 44 CopySize 45 ); 46 47 // 48 // SecSwitchStack function must be invoked after the memory migration 49 // immediately, also we need fixup the stack change caused by new call into 50 // permanent memory. 51 // 52 SecSwitchStack ((UINT32) TemporaryMemoryBase, (UINT32) PermanentMemoryBase); 53 54 // 55 // We need *not* fix the return address because currently, 56 // The PeiCore is executed in flash. 57 // 58 59 // 60 // Simulate to invalid temporary memory, terminate temporary memory 61 // 62 //ZeroMem ((VOID*)(UINTN)TemporaryMemoryBase, CopySize); 63 64 return EFI_SUCCESS; 65 } 66
